MySQL Database Found errors

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MySQL Errors: SELECT id,TITLE,SHOPURL,shop_s_url,is_get FROM `shop_index` where catid= '' AND xing < order by xing desc LIMIT 0, 20 MySQL Errors Code: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'order by xing desc LIMIT 0, 20' at line 1